IRIS S550, Руководство по применению, Страница: 4 / 19

viewing head housing. (See Fig. 2). For every 128
pulses from the UV sensor it emits one green
pulse; for every 128 pulses from the IR sensor it
emits one red pulse. With a count rate of 1200
displayed at the signal processor the LED will
flash 9 or 10 times per second. This is very useful
for aiming and sighting the viewing head. One can
readily distin guish differ ences in pulse rates at the
LED and use this indicator to adjust the sighting to
obtain a maximum pulse rate at the LED and
therefore a maximum reading at the signal
processor.
The S550 differs from older models in that the
gain for each sensor and the selection of the filter
for IR may be set remotely through the front panel
of the P520/P522 signal processors.
Also the earlier IR sensitive family members had
only 4 high pass filters to choose from; the S550
has 8:
S511 & S512 S550
LL 36 Hz 1 16 Hz
L 71 Hz 2 24 Hz
M 105 Hz 3 33 Hz
H 186 Hz 4 52 Hz
5 75 Hz
6 100 Hz
7 155 Hz
8 215 Hz
TECH NOL OGY USED IN THE S550
The UV and IR sensors in the S550 share a
common optical axis efficiently by using a unique
dichroic beamsplitting mirror. Over 80% of the
ultra violet light is reflected off the surface of the
45 de gree mirror and yet over 80% of the infrared
radiation is trans mitted through the beamsplitting
mirror.
The electronics in the S550 is designed using
highly reliable surface mount technology.
The high pass frequency responses of eight
different filters in the S550 and S552 are imple -
mented compu ta tionally in a high- performance,
CMOS micro con troller inside the viewing heads.
This approach reduces the parts count and
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IRIS MODEL S550 APPLICATION MANUAL